Synthesis and characterization composite cellulose-TiO2 from sawdust and its application as adsorbent of Cd(II) in aqueous solution

Abstract

Extraction of cellulose from wood sawdust using methanol and hydrochloric acid within the various concentration of 1%, 3%, 7%, and 11% (v/v) for 3 hours has been done. The cellulose has characterized by FTIR spectrophotometer and shows that the best concentration for that process was 7% of HCl. The Cellulose than composited with TiO2 and used as adsorbent of Cd(II) metal ion in aqueous solution. The adsorption of Cd(II) metal ion at various concentration gave the value of adsorption rate of Cd(II) metal ion in cellulose was 2.10-6 with an adsorption energy of 22.3 kJ/mol, meanwhile in cellulose-TiO2 composite was 3.10-7 with an adsorption energy of 20.7 kJ/mol. The sequential desorption of Cd(II) metal ion using H2O, HCl, and EDTA solutions were applied to know the adsorption mechanism. The result of desorption showed 22.6% of Cd(II) was desorption by HCl and EDTA reagents indicate that chemical interaction has occurred for cellulose adsorbent while for cellulose-TiO2 composite gave 71.2% desorption by H2O indicate the physic interaction.